To troubleshoot display issues with your Apple Pay integration, ensure that you meet the following criteria:
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The domain where you're displaying the button has a valid TLS certificate, and is a registered merchant domain with Apple.
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Your Apple merchant ID has a valid and signed payment processing certificate.
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The device you're rendering the page on is macOS version 10.12 or later.
Additionally, ensure that you are using a valid card based on the rules you set in the supportedNetworks property of your front-end Apple API. For more information, see Apple Pay.